PIC16F916-I/ML【PDF 22/229 页】IC PIC MCU FLASH 8KX14 28QFN

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202

8018P–AVR–08/10

ATmega169P

rjmp

SPITransfer_loop

lds

r16,USIDR

ret

The code is size optimized using only eight instructions (+ ret). The code example assumes that

the DO and USCK pins are enabled as output in the DDRE Register. The value stored in register

r16 prior to the function is called is transferred to the Slave device, and when the transfer is com-

pleted the data received from the Slave is stored back into the r16 Register.

The second and third instructions clears the USI Counter Overflow Flag and the USI counter

value. The fourth and fifth instruction set Three-wire mode, positive edge Shift Register clock,

count at USITC strobe, and toggle USCK. The loop is repeated 16 times.

The following code demonstrates how to use the USI module as a SPI Master with maximum

speed (fsck = fck/4):

SPITransfer_Fast:

sts

USIDR,r16

ldi

r16,(1<<USIWM0)|(0<<USICS0)|(1<<USITC)

ldi

r17,(1<<USIWM0)|(0<<USICS0)|(1<<USITC)|(1<<USICLK)

sts

USICR,r16 ; MSB

sts

USICR,r17

sts

USICR,r16

sts

USICR,r17

sts

USICR,r16

sts

USICR,r17

sts

USICR,r16

sts

USICR,r17

sts

USICR,r16

sts

USICR,r17

sts

USICR,r16

sts

USICR,r17

sts

USICR,r16

sts

USICR,r17

sts

USICR,r16 ; LSB

sts

USICR,r17

lds

r16,USIDR

ret

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